Datasheet

ST3237EB Electrical characteristics
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Note: Transmitter skew is measured at the transmitter zero cross points
Table 8. Receiver (C
1
- C
4
= 0.1 µF tested at 3.3 V ±10 %, V
CC
= 3 V to 5.5 V, T
A
= -40 to 85 °C,
unless otherwise specified. Typical values are referred to T
A
= 25°C)
Symbol Parameter Test conditions Min. Typ. Max. Unit
I
OL
Output leakage current Receiver disabled, EN = V
CC
± 0.05 ± 10 µA
V
OL
Output voltage low I
OUT
= 1mA 0.4 V
V
OH
Output voltage high I
OUT
= -1mA V
CC
-0.6 V
CC
-0.1 V
V
RIN
Receiver input voltage
operating range
-25 25 V
V
RIL
RS-232 input threshold
low
T
A
= 25°C, V
CC
= 3.3V 0.6 1.1
V
T
A
= 25°C, V
CC
= 5V 0.8 1.5
V
RIH
RS-232 input threshold
high
T
A
= 25°C, V
CC
= 3.3V 1.5 2.4
V
T
A
= 25°C, V
CC
= 5V 1.2 2.4
V
RIHYS
Input hysteresis 0.3 V
R
RIN
Input resistance T
A
= 25°C 3 5 7 KΩ
Table 9. Timing characteristics (C
1
- C
4
= 0.1 µF tested at 3.3 V ±10 %, V
CC
= 3 V to 5.5 V,
T
A
= -40 to 85 °C, unless otherwise specified. Typical values are referred to T
A
= 25 °C)
Symbol Parameter Test conditions Min. Typ. Max. Unit
D
R
Maximum data rate
R
L
= 3KΩ, C
L
= 1000pF
one transmitter switching, VHSCI=GND
250 Kbps
R
L
= 3KΩ, C
L
= 250pF
one transmitter switching, VHSCI=V
CC
V
CC
= 3 to 4.5V
1000 Kbps
R
L
= 3KΩ, C
L
= 1000pF
one transmitter switching, VHSCI=V
CC
V
CC
= 4.5 to 5.5V
1000 Kbps
t
PHLR
t
PLHR
Propagation delay input to
output
R
IN
to R
OUT
, C
L
= 150pF 0.15 µs
t
PHLR
t
PLHR
Propagation delay input to
output
R
L
= 3kΩ, C
L
= 1000pF,
VHSCI=V
CC
VHSCI=GND
400
1000
ns
ns
t
T_SKEW
Transmitter skew
|t
PHL
- t
TLH
|, VHSCI=GND 300 ns
|t
PHL
- t
TLH
|, VHSCI=V
CC
50 ns
t
R_SKEW
Receiver skew |t
PHL
- t
TLH
| 100 ns
t
OER
Receiver output enable time Normal operation 50 ns
t
ODR
Receiver output disable time Normal operation 120 ns
S
RT
Transition slew rate
T
A
= 25°C R
L
= 3 to 7KΩ, V
CC
= 3.3V
measured from +3V to -3V or -3V to +3V
C
L
= 150pF to 1000pF, VHSCI=GND
C
L
= 150pF to 1000pF, VHSCI=V
CC
C
L
= 150pF to 2500pF, VHSCI=GND
6
24
4
30
150
30
V/µs
V/µs
V/µs